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A flexible lithium ion battery current collector, flexible lithium ion battery and preparation method thereof

A technology of lithium ion battery and flexible electrolyte, applied in the field of lithium ion battery, can solve the problems of inflexibility, high monthly self-discharge rate, damage to the interface of positive and negative electrodes, etc., and achieve the effect of low self-discharge rate and improved safety.

Active Publication Date: 2018-05-08
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these metal sheets generally cannot be bent and squeezed, and are not flexible
Therefore, the lithium-ion battery has considerable hardness and cannot accept deformation due to external force
If the lithium-ion battery is deformed, it will damage the interface between the positive and negative plates and the diaphragm, resulting in deterioration of battery performance and affecting the normal use of end users
At the same time, the existing lithium-ion batteries usually contain electrolyte, the monthly self-discharge rate is high (6-8%), and it is easy to cause liquid leakage, and the safety needs to be further improved

Method used

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  • A flexible lithium ion battery current collector, flexible lithium ion battery and preparation method thereof
  • A flexible lithium ion battery current collector, flexible lithium ion battery and preparation method thereof

Examples

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preparation example Construction

[0030] In the present invention, the preparation method of the positive electrode colloid 1 may include: uniformly mixing the flexible electrolyte, carbon nanotubes and positive electrode materials to obtain a mixture, and then co-extruding the mixture to make the positive electrode colloid 1, wherein the flexible electrolyte and carbon nanotubes The tube weight ratio is 1:10-10:1.

[0031]As mentioned above, when preparing the positive electrode colloid 1, the ratio of the total weight of the flexible electrolyte and carbon nanotubes to the weight of the positive electrode material is preferably 0.05:0.95-0.3:0.7.

[0032] In the present invention, the preparation method of the negative electrode colloid 2 may include: uniformly mixing the flexible electrolyte, carbon nanotubes and negative electrode materials to obtain a mixture, and then co-extruding the mixture to make the negative electrode colloid 2, wherein the flexible electrolyte and carbon nanotubes The tube weight r...

Embodiment 1

[0064] This example is used to illustrate the flexible lithium ion battery of the present invention and its preparation method.

[0065] (a) Mix lithium cobaltate, carbon nanotubes and modified polyacetylene polymer in a mixer at a weight ratio of 90:3:7 to obtain a mixture, and then co-extrude the mixture through an extruder to produce A positive electrode colloid 1 with a diameter of 6mm in a semi-cylindrical shape;

[0066] (b) Mix graphite, carbon nanotubes and modified polyacetylene polymer in a mixer at a weight ratio of 80:5:15 to obtain a compound, and then co-extrude the compound through an extruder to make a diameter Negative colloid 2 of a semi-cylindrical body of 6mm;

[0067] (c) if figure 1 As shown, the positive gel 1 and the negative gel 2 are cut to a length of 10 cm, and a positive gel 1, a separator 3 and a negative gel 2 are completely overlapped and stacked into a flexible battery module by lamination and pressing, so that the separator 3 Set between th...

Embodiment 2

[0071] This example is used to illustrate the flexible lithium ion battery of the present invention and its preparation method.

[0072] (a) Mix lithium iron phosphate, carbon nanotubes and modified polyaniline polymer in a mixer at a weight ratio of 95:4.54:0.46 to obtain a mixture, and then co-extrude the mixture through an extruder to produce Anode colloid 1 with a width of 5 cm and a thickness of 3 mm;

[0073] (b) Mix nano-iron oxide, carbon nanotubes and modified polyaniline polymer in a mixer at a weight ratio of 98:1.81:0.19 to obtain a mixture, and then co-extrude the mixture through an extruder to produce Negative electrode colloid 2 with a width of 5 cm and a thickness of 3 mm;

[0074] (c) if figure 2As shown, the positive colloid 1 and the negative colloid 2 are cut to a length of 10 cm, and the three positive colloids 1, five separators 3 and three negative colloids 2 are completely overlapped and stacked into a flexible battery module by lamination and pressi...

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Abstract

The invention discloses a flexible lithium-ion battery current collector. The flexible lithium-ion battery current collector includes a flexible electrolyte and carbon nanotubes, and the weight ratio of the flexible electrolyte to the carbon nanotubes is 1:10-10:1. The invention also provides a flexible lithium ion battery comprising the flexible lithium ion battery current collector and a preparation method thereof. The flexible lithium ion battery of the present invention can be bent and squeezed, can be designed freely, is not limited by battery characteristics, and has a small self-discharge rate and high safety.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a flexible lithium-ion battery current collector, a flexible lithium-ion battery and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary battery with high energy density, high reliability, good processability and excellent environmental performance, and has been widely used in various portable electronic devices. Existing lithium-ion batteries include a positive electrode sheet, a separator, a negative electrode sheet and an electrolyte stacked and wound on top of each other. The separator is spaced between adjacent positive and negative electrode sheets to insulate the positive and negative electrode sheets and to maintain the electrolyte. The positive sheet includes a positive current collector and a positive material layer formed on the surface of the positive current collector. The negative electrode sheet includes a n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M10/058
CPCH01M4/66H01M4/663H01M4/666H01M10/0525Y02E60/10Y02P70/50
Inventor 陈苏里
Owner BYD CO LTD
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